Sometimes it dissapears and other times I can see the standard noise-gate plugin but there are no longer blank panels to add new plug-ins... I'm going to make a screencast now and see if I can capture the behavoir because I think that's the best way to understand what's going on. Here is a screen shot of my plug-ins folder.
OK. I just made a screen recording and it took a few minutes to happen, but the problem I described does happen around 4:20 in. Start the movie at 3:00 if you want to bypass me trying to recreate the issue and just get to the section where I explain the problem before it actually happens.
HMMM.. ok, the add video icon is greyed out so I'll be right back after uploading this to Youtube...
OK, here is the link
Sorry for the not-so-good mic quality...