Problem in PicPick 3.1.5 (printscreen – Tool)

I am using PicPick 3.1.5 (Printscreen-Tool) on our Windows Server 2008 R2 (x64) with Citrix XenApp 6.5. Everything work perfectly when I access the XenApp-Server with Windows Citrix-ICA-Clients.
But when I access the XenApp-Server with a Linux based Citrix-ICA-Client and start PicPick the problem begins.
An error message is shown from the linux Citrix-ICA-Client:
Citrix Receiver The X Request 53.0 caused error: "11: BadAlloc (insufficient resource for operation)"
After clicking OK the ICA-Session get killed. What should I do to solve this problem?
