I'm using the latest Platinum release.  I'm having to move all my audio from one project to another due to an issue with comping not working properly.  I am able to copy audio clips from one project to another using Ctrl-C and Alt+Ctrl-V as long as I'm pasting to tracks.  I can paste into a take lane, but when I create another take lane and try to paste another take using the same technique, the paste causes my previous take lane to go blank.
 
So far this has been 8 hours of frustration.  I've got 30 minutes of guitar takes and I can't use them.  Not in my first project.  And I can't get them into my second project (other than as individual tracks.)  Screw it.  I'll just record the guitar part over again...
 
ARGH
 

I have run into this, so I copy the take to a track then I can shift drag it to the lane (shift is to keep the time position)

If you select the source audio track that contains Take lanes, hit Ctrl+C and then select the destination audio track (that has no Take lane) and hit Ctrl+V, Take lanes will automatically be created in the track and all the takes will be pasted into them, won't they? 

Cut and Paste for Take Lanes is a hit and miss affair, and has been since they were first added. I don't get why such and important feature as cut and paste has not been addressed by the bakers.  It must be a too-hard. 

There are also major issues when cutting and pasting whole multiple tracks. These even predate take lane issues.
 
I have found work arounds for all of them. For example, when cutting and pasting whole sections of a project, I create a space in teh project using the add time feature exactly equal to what I am going to paste in. I can't use the regular paste feature because sometimes some tracks are moved the same amount and some will move wonky. No rhyme or reason.
 
My best advice is this: know it's not you.  Experiment with work arounds.
 
I wish this most basic of all features in a DAW worked.
 
Rick
 

Based on the Early Access release announcement it looks like they may have dealt with this issue.
 
I too have never really been able to do straight Copy/Pasta within lanes so just always used Ctrl + Shift + drag. It's annoying (especially waiting for the Track View to scroll past a ton of lanes and/or other tracks) but it's generally foolproof.
 
Certainly hoping the new lane/comping improvements help.
 
Cheers.