Problem with Action Recommended box in MRP

I have one weird error on a PC that I have tried everything I can to fix.

If the user goes into Planning and the MRP Recommendations List and tries to Action something, it brings up the Action Recommendations box in the task bar but its completely blank and it cant be bought onto the screen (it doesn’t draw the box) 

I have tried uninstalling and reinstalling Sage and I have tried to do a repair on the VC++ frameworks that Sage uses, rebooted a few times and nothing has fixed it. It was fine yesterday. All of the other functions work in Sage work fine, its just this one bit.

Has anyone seen this before? It’s a new one on me. I cant see why just this function wouldn’t work.