My 2 cents... Agree with several comments above and towards that end...
 
Freeze tracks or capture audio real time and disable synths till u can afford a rock solid interface like RMI. Takes no time, costs you nothing and relieves latency/dropout issues till ya get the bucks. I don't make money on music either but sacrificed lots of things to get what I need to do what I love. Babyface pro is a dream come true in terms of stability, latency, amazing mic pre's and dacs
 
The latest version of sonar makes this easy.

Vastman
Freeze tracks or capture audio real time and disable synths till u can afford a rock solid interface like RMI. Takes no time, costs you nothing and relieves latency/dropout issues till ya get the bucks. I don't make money on music either but sacrificed lots of things to get what I need to do what I love. Babyface pro is a dream come true in terms of stability, latency, amazing mic pre's and dacs

Although I have to admit the freezing in Sonar is pretty damn convenient, it didn't really tackle this particular problem with the LP Plugins on the master bus. I don't know, something is wrong here. It just doesn't really compare, such low load, such big problems. Probably my own fault, if I see a small problem like this I can't let go until I solved it entirely. 
 
Probably trying to catch a straw here, but what about those ESI PCIe cards? Maya44 eX and Juli XTE, anyone has ever tested them? Which of these two cards is the newer one? I still find shopping offers for Maya, but not for Juli. Even Ebay only has 1 card listed broken worldwide.
 
 I always see that as a good sign btw. Ebay is full of my M-Audio Delta 44, but it's the good stuff people keep and don't sell.

Are you tracking with the LP plug-ins on any tracks/busses?   You will see a significant improvement by bypassing those effects while tracking.

dwardzala
Are you tracking with the LP plug-ins on any tracks/busses?   You will see a significant improvement by bypassing those effects while tracking.

Only on the master bus. Of course they introduce additional delay. The problem is however should they cause Midi dropouts? Why are they causing Midi dropouts with the original driver and not with ASIO4All?

Seems like a simple thing to try and bypass them to see if you get an improvement.  Sometimes there are interactions that aren't obvious.

dwardzala
Seems like a simple thing to try and bypass them to see if you get an improvement.  Sometimes there are interactions that aren't obvious.

 
Sure, I've done that many times, and yes, of course it improves things. I thought that might be obvious, and also it kinda was the whole point (at least part of the point). I'm not sure what you're trying to say. You mean those plugins are the problem? In another thread people tried to convince me that they're not. And I have to admit back then I didn't know what "linear phase" meant, and why the introduced delay cannot be avoided unless we invent time machines. But that delay shouldn't cause dropouts, neither audio nor midi, at least not at this high buffer sample size we're talking, 1024. Or am I wrong about that? What happens on your machine when you chain LP EQ, LP MB and the new Adaptive Limiter on highest quality settings? Do you get Midi-dropouts, too? Do you have to raise your ASIO buffer to 1024 and beyond?

You can probably pick up a used MOTU Ultralite Mk3 on eBay in the general neighborhood of $325. But, I'd make sure I understood the causes of my problems before swapping out interfaces. But, if it were me, I'd just save my pennies for an RME Babyface Pro. Been using my RME UFX for several years without a single hiccup from day 1.

pfschaefer
You can probably pick up a used MOTU Ultralite Mk3 on eBay in the general neighborhood of $325. But, I'd make sure I understood the causes of my problems before swapping out interfaces. But, if it were me, I'd just save my pennies for an RME Babyface Pro. Been using my RME UFX for several years without a single hiccup from day 1.

It's hard to determine the cause of these problems, cause I don't have other hardware to compare it to and nobody here seems interested in sharing the results on their own machine with this particular setup of the LP plugins.

occide

dwardzala
Seems like a simple thing to try and bypass them to see if you get an improvement.  Sometimes there are interactions that aren't obvious.

 
Sure, I've done that many times, and yes, of course it improves things. I thought that might be obvious, and also it kinda was the whole point (at least part of the point). I'm not sure what you're trying to say. You mean those plugins are the problem? In another thread people tried to convince me that they're not. And I have to admit back then I didn't know what "linear phase" meant, and why the introduced delay cannot be avoided unless we invent time machines. But that delay shouldn't cause dropouts, neither audio nor midi, at least not at this high buffer sample size we're talking, 1024. Or am I wrong about that? What happens on your machine when you chain LP EQ, LP MB and the new Adaptive Limiter on highest quality settings? Do you get Midi-dropouts, too? Do you have to raise your ASIO buffer to 1024 and beyond?

I don't use LP EQ, LP MB during tracking.  They are not designed to be used that way.  When I am mixing I set my buffer to 1024 or 2048 because at that point latency doesn't matter and I don't have any issues with much older rig than yours.
When I am tracking if I need EQ or compression (which is rare) I use prochannel stuff which doesn't consume a lot of resources.
 
I suspect that even if you upgrade your interface, because you are using plug-ins during tracking that aren't designed to be used then, you may not get an improvement in performance.
 
As you have said, you want to make music and not fight these things - just bypass those effects and get to doing what you love.

dwardzala
I don't use LP EQ, LP MB during tracking.  They are not designed to be used that way.

Yes and no. It is not clear what "highest quality settings" means. Assuming it means a precision setting other than Non-Linear, yes that is probably not a good idea while tracking. The Non-Linear setting is a reasonable setting for tracking and may even be the preferred setting regardless of how the plug-ins are used.