Super slow to launch, runs all wrong

OS: Win 10
PsychoPy version (e.g. 1.84.x): 3.2.x
What are you trying to achieve?: I’m trying to implement a simple Lexical Decision Task
What did you try to make it work?: I had a build that worked last year when on Psychopy 1.84.x. Now we replaced our PCs and I installed the newest version of PsychoPy. I tried using the old .psyexp file and I tried making a new one from scratch.

What specifically went wrong when you tried that?: The .py file runs fine on two computers, but on the other two it will open onto a blank screen and take 5+ minutes to load the instructions slide. Once the instructions slide is loaded, it reacts to button-presses with about 2s of latency and displays fixation cross and target simultaneously. Help!

Also aggravating is that Experiment Builder appears to take several minutes to launch, somehow. Is it because I don’t have admin privileges on this computer?

I have put the LDT files on GitHub at https://github.com/Joe-Hilgard/psychopy-ldt in case you can help me reproduce or identify the problem.

I’m dyin’ out here! Thanks in advance!