grey MinimWatch icon on DS213+

[wolfm]

Hello to the community
On my DS213+ (DSM 6.1.3-15152 Update 8) I have installed MinimServer 0.8.4.2 and on Win7 MinimWatch 0.8.4.
Since some weeks there is only the grey icon instead the "good green" ;-)
in the meantime I tried to uninstall my antivirus (AVG, latest version), another software I don't know, what could cause that problem?
what to do, to get the ("my") green icon?
The DS213+ runs and play the music as always (/w bubble ds next)
I hope you can help.
greets from vienna, wolfgang