I'm having an issue when editing the names of nodes. When I click on the node and press F2 to edit the name, I can't use spaces and some characters ('c' and 'f'), they just don't appear in the node name. I'm trying to find out if this is a local issue or a general issue with KNIME?
This seems to be working fine for me, if you give me more details on your setup (KNIME version and OS) I can investigate further.
I'm using KNIME Desktop Product 2.6.0.0034521 on 64-bit Windows 7.
The same problem occurs when I try to write a Workflow Annotation.