I recently upgraded to LR 6.5 and corrected permission error and now LR is crashing. I uninstalled 6.5 and re installed 6.0 but continues to crash
Go back to Lightroom 6.5, try turning off the graphics acceleration.
Go to Preferences, click on the performance tab, then uncheck the box.
Tried that and it didn't stop it.
Do you get an error message? If you do, what is the complete exact unedited word-for-word error message?