On a panel it is not possible to access an enabled folder from a computer with the Windows XP SP3 operating system installed.
After the security update KB2267632 of 12/2010 for Windows CE 5.0 from Microsoft it is no longer possible to access the enabled folders if the difference between the system times of a panel with Windows CE 5.0 and a PC with Windows XP SP3 is longer than two days. The security update prevents access in this case.
Make sure that the system times of the two systems lie within two days of each other.
This concerns panels as from Windows CE 5.0 with Images as from 12/2010.