Have default template option that allows Tray Components > "In Model" as default save. I hate having the "Components Sampler" as the default open option.
Have default template option that allows Tray Materials > "In Model". Somehow Mine always opens a "wood" folder.
I have tried creating a templates, saving the trays with "in model" as last opened, but new files always open to the above mentioned folders.

Same problem here after installing SU 2015. Renaming the ThumbsUp files seem to work. Primarily occurred in one drawing project folder and subfolders with all my current SU files, CAD, reference photos and pdfs which were created in SU 2014. I did find some info in the windows error messages that said it was related to ntdll.dll. I am on Win7 pro current service packs etc. I did like the added thumbnail views that 2015 offered.
Hope that gets a fix within Sketchup soon. Thanks to all!

Thanks TIG. Length snapping was off. I was working in a normal Architectural scale, not micro small objects.I realize one can only zoom in so far. I have experienced problems in older versions, sometimes really large, complex models that caused similar issues.

My best solution was to save file. Then reopen. No problem after that. Perhaps a plugin I used caused the strange behavior. Thanks for the advice and tips.

I am having a problem with SU 2015 Pro 64 bit. SU is not finding endpoints for line segments. This is frustrating trying to draw new lines from an intersection or endpoint of previously drawn lines. Any thoughts?

Thanks for the help. the files were uploaded via dropbox and opened by the other collaborator on MAC.
Here is another wrinkle. One of the files was made in sketchup 8 then opened in SU2013 and saved as a SU2013 file. The MAC user could not open either v8 or 2013 versions. Other PC collaborators could open my files from the dropbox or usb drive files.
I hope this an isolated incident with just one user. I regularly team with PC and MAC users and never had cross platform issues with earlier sketchup versions.
I had issues with the first release of 2013 not loading some SU plugins properly. The recent update fixed that with most plugins.
No problems using SUv8 files linked to Layout 2013. Love Layout 2013!

Anyone having problems creating new v2013 .skp models on a PC and not able to open them on mac with same v2013 Sketchup?