String Manipulation node disappeared - anyone else?

Dear Hive mind

I have set up a work flow last week using the string manipulation node (amongst others). Opening the work flow today, the string manipulation node is missing with the following message:

Node description for MISSING String Manipulation:

"

Placeholder node for missing “String Manipulation”.

Node “String Manipulation” not available from extension “KNIME Javasnippet” (provided by “KNIME AG, Zurich, Switzerland”; plugin “org.knime.jsnippets” is not installed)"

"

Javasnippet extension is installed - I get an error message if I try to install it again. I have not changed anything in the workflow or in Knime between last week and today.

Has anybody else got the same problem? I have rebooted Knime and the laptop to no positive effect.

Best wishes,

Marie