There is a conflict between Returnil (Rel. 13) and the latest version of SugarSync (1.9.41). The SS Manager (the local program) can´t be opened with the virtual protection enabled, and therefore the backup can´t be synchronized. The attached window appears. Translation: SS has detected that there are two disks in your system (C:\ and Z:\) which have the same volume serial number. SS requires that all the computer disks have a different volume serial number. To use SS, you need to change the serial number of one of these disks. Apparently, there is no problem if SS Manager is opened first and then Returnil is enabled.