insertion of any effect (vst or prochannel) causes a crash

So I resumed work today on a project, on which I had several trouble-free sessions these past few days. First, I needed to put a Toraverb on my snare. Glitch, then crash. Started over, this time with success. Then, I tried to insert another Toraverb (usually very stable, by the way) on my hi-hat audio track, which caused a severe glitch, followed by a crash. Didn't think much of it, went back and inserted a Breverb instead, just to see, and no crash. Then I went to insert a Concrete Limiter in one of my buses. What ensued was a record breaking glitch, followed by another crash, so something is going on. What could have caused this previously well-behaved project to turn rogue on me? I didn't do or change anything. Though, I did notice something weird: auto-track zoom, which I never use, was enabled upon loading the project. I was on my usual screenset 1 which doesn't have that, and it definitely wasn't on when I last saved.
 
For your amusement here's a screenshot of my X2a experience for today. Can't see very well but yes, those are all 99.9.
 
 
 
 

 
update... it definitely seems related to my toraverb. ever since it got its way onto my snare track, inserting anything will cause the glitch. if I remove it, though, everything is back to normal. most annoying. this plugin is usually trouble free. tested it out in another project, no problems. quite strange.