It's important to realize that we (the users) have some responsibility in the update/upgrade process, in terms of making sure what we have will run on our computers, in other words meeting minimum requirements is OUR responsibility.
There have been cautionary posts in the forum already, concerning some things not running properly or even at all in Windows 8.1, and for something as important to the whole environment as the operating system, we should all make sure we do our homework prior to doing things like expecting it all to simply work on the newest OS release (8.1).
Some drivers will simply not work in Windows 8.1, and some do not even work in Windows 8, and some do not even work in Windows 7.
I am quite happy you got it to work with that simple of a fix, and hopefully you will remember to check out your drivers and applications ahead of time, next time you contemplate upgrading your operating system.
Please understand I am not trying to bust on you - simply trying to reinforce checking things out ahead of time, so that these kinds of problems do not even occur, and so that Cakewalk does not get blamed for things they did not cause.
Bob Bone