Hi Knime,
When using a browse button (e.g. in the FileReader) Knime saves the history in a log file located in the .metadadata/knime directory. Unfortantely, the browse button does not work after a workflow has been reopened, if an history-entry is longer present in the filesystem.
The only solution to make the browse-button to work again is to delete the corresponding history-log-file.
IMHO it's a real showstopper. :-(
Best, Holger