While creating an android project in Eclipse, I get the error:
[2014-03-13 15:14:36 - appcompat_v7] WARNING: unable to write jarlist cache file C:\\Users\\Neel
Just got the same problem today.
In my case the combination of your advices became a solution:
In Eclipse project bar I have deleted Appcompat(XYZ) and the new project that I just created.
Checked for updates - no updates were found.
Clicked File -> Restart.
While creating new project have chosen API 14 as Minimum Required SDK.
Done.