Hey,
Thanks for the reply.
So, I moved all my AU components to my desktop, and I've slowly been adding them back in to their logic folder. I don't really understand what's going on but the project that for some reason doesn't like SPL Transient Designer anymore, now works, so long as the SPL TD component file remains on my desktop (so that plugin is out of use for now). The problem seemed to be fixed, and I was able to open other projects successfully, however, I've tried opening up a recent project I made and it crashes but doesn't give an explanation, it simply states "Logic Pro X quit unexpectedly"...it's so frustrating. I have no idea why this particular project is crashing. Any suggestions on what it may be?
Cheers