I have been using Calibre for a year now with few problems. Those I had I was able to solve with the manual.
I installed the 64bit app and worked well so uninstalled 32bit version.
As of yesterday the programme has been crashing on multiple occassions.
I cannot convert from epub to mobi at all, can from mobi to epub.
Also crashes if adding books, editing metadata on random occassions.
I am running Windows 8 pro, with the latest calibre version - crashing started in 0.9.11.
There have been no hardware or software changes other than above.
Any help, please.