The file attached below will save, but loose all formatting (only values remain). I don't know what I did but any content I copy out of my main database (14MB .xlsm) into any .xls file now refuses to retain color coding, border schemes, etc. and the only solution I found is to save as an .xlsx which isn't ideal. Why did this start happening all of a sudden? Hopefully someone can find out by examining the attached xls file. For example, add a yellow background to the first cell, insert 5 and bolden it and attempt to ctrl+s then re-open it. The background will be gone and boldness = false!
PS I just noticed it's 647KB so there's definitely something
http://dl.dropbox.com/u/2421809/test.xls