Using V2.83
Using 'Export' on any selection (ergo "CSV") I get error:
"SYNTAX ERROR IN FORMATTING STRING"
This error description is quite poor, because it is not comprehensible in this way.
Please explain in more detail.
For sure, do update to version Mp3tag v2.83e.
In general the error message "SYNTAX ERROR IN FORMATTING STRING" points to a Mp3tag format string, which has a syntactical error.
Within the dialog "Export", this may happen in the edit field, where the filename of the export file has to be defined.
DD.20170722.0932.CEST