ONFLAPP  The problem is most probably caused by one of tag names in the 'recently used tags' is perhaps too long, containing binary characters or is 'corrupted' in some other way. Since this list is shared by all OpenMeta application it is possible this tag came in from outside of TagoMan itself.

The solution is to 'clear the recently used tag list' in the TagoMan's preferences  
(Version 2.0.4)

ONFLAPP  The upcoming update will be able to tag DEVONthink records. Sorry about the eaglefiler and macjournal - these apps are not scriptable so I could not extract information I would need to support them.

HINT: it is possible to refer to a tag by using a link e.g. tag://MyTag. This way you can link to group of files  
(Version 2.0.1)

ONFLAPP  the screenshot is (was) for the old version. The new interface looks very different. I uploaded new screenshot meanwhile. Sorry for the confusion  
(Version 2.0.1)