Strange1

I have been using Cura 5.0 since about a week after its release with no issues. Today, while trying to manipulate the settings on a fairly large stl (54mb) it froze. After letting it sit frozen for about 15 minutes, I force closed Cura and tried to restart it. Now it won’t open fully. It'll run through the splash start-up screen, then move on to a white window titled “Ultimaker Cura (Not Responding)” and never goes any further. I uninstalled and reinstalled 5.0 and that had no change. I then uninstalled ALL previous versions of Cura and reinstalled only 5.0, still with no success. PC Specs: Windows 10, Intel i7-9700K; 32Gb RAM; NVIDIA RTX 2070; everything fully updated. Please help! Charlie.