newest client crashes when I start any puzzle before finishing the one I was on. Many times the tutorial says "now try a real protein" and, if i load it up, I crash when i try to go back to tutorial puzzles. switching to any puzzle seems to do it, if it didn't get offered by a pop-up (i.e. level complete)

Please read Rav's excellent post in the forum about how to provide feedback to report bugs and crashes. It really helps.
Also sometimes just trying to replicate the problem yourself can provide an 'oops!'moment, and always gives better information for diagnostics.

Feel free to bite my head off :D