Yes, we made that horror of horrors discovery when Barry and I did some testing behind the scenes, using the Net Worth currency conversation feature.
Google Finance (the source used for the Conversion by Bank Genie) have changed that service without telling me
I will update that tomorrow.
It is impossible for the Transaction Analyser (or any competitors report) to produce an accurate report when accounts of multi currencies are selected for analysis.
The currency conversion figure is different for every day of the date range of the report.
To be accurate it would require a conversation rate for every transaction (e.g. in your CZK account.)
That's why I didn't provide it.
Net worth is different in that you are doing a calculation for a date in time, so its correct for the date you run the report.
I will look at an update to the Transaction Analyser if you feel it is necessary.