I have had several problems, for example:
1. The home page doesn't display correctly off-line, the large picture on the top left is always missing.
2. Offline Explorer Pro creates a never-ending hierarchy with folder names like this: " url(themes\spotlight [..] url(themes\spotlight [..] url(themes\spotlight "
Also other parsing-related problems.
I have checked manually the HTML of the source code on drupal.org, and it looks very clean and correct to me.