Parts and Drawings Glitching

I've got an odd one and was wondering if anyone else has experienced this/has a solution?

I have been using Creo 11 parametric with an educators licence. Yesterday I was creating a fairly basic drawing, upon saving the drawing it crashed on me (this isn't a regular occurrence). When attempting to re-open the drawing it 'loaded' but nothing was displayed, no template, model or annotations. I closed the program and tried to open different drawing, but this time only the template and annotations loaded in, no model visible. Loading parts and assemblies also became difficult, with components not rendering properly. Often models would load in only as wireframe even if a shaded option was selected, also on occasion large orange triangles will be displayed around the part? 

After trying various options I uninstalled Creo 11 and re-installed with Creo 12. I am finding that the same issue is still occurring? The drawings sometimes load in partially/completely if I open the part first, but trying to save the drawing then crashes the program. I am at a loss! I have run Creo 11 for a couple of years on my device and never had any major issues. How should I troubleshoot this further? Is this a known issues with Creo? Please see attached images for the aforementioned issues. 

Any help is much appreciated! 🙂