[BUG] Unable to open spectrum-cards when switching user

[schote]

Once an experiment was performed with user 1, the cards cannot be opened after switching to user 2 trying to execute a similar experiment.

Possible causes:

• closing of spectrum-cards
• kernel module

ToDo's

• Minimal example to reproduce problem
• Check manual for "closing" spectrum-cards correctly
• Try to fix issue by reloading kernel module