I start to typing the formula:
=conc
in one point calc suggest me proper formula (conacatenate) and then I hit [Enter] to autocomplete.
In this moment calc removes equal sign “=” from the beggining of the formula leaving olny plain text in cell
concatenate()
with cursor blinking between brackets …
Other formulas seems to work properly. Got this error
I’m using polish edition and this function is called "=złącz.tekst"
Can you try to concatenate using formula wizard?
Wizard works. It’s all about manually typed formula.
Got another question - if I type “=C” calc suggest me few formulas starting with this letter - how can i switch between them ?
Ctrl+Tab forward, Shift+Ctrl+Tab backward.
thanks erAck - altought non-intuitive (should be tab or arrow up/down, enter to accept)
Which release version are you using anyway? 5.1 or 5.2? Or something older?
Does that happen also with other function names? I suspect this might be related to the ł and ą in the Polish function name and there’s a pattern that function names with such character (or the combination) make the completion fail and functions without such character don’t, is it? If so then please report a bug in our bug tracker.
Currently I’m using 5.2.0.4.
It could probably happen before but i do not bet on that, I did’nt install new releases 'cos 5.3 was non-usable at all (freezes, force closes…).
It could be connected with polish characters 'cos “if error” formula
=jeżeli.błąd
also deleting equal sign … 
Doesn’t happen with
=CZ.CAŁK.DZIELENIA()
(quotient if i recognize right)
Little mistake in version numbering
I used previously 5.0.4 and jump already to 5.2.0.4 got problems with 5.1 family (not with 5.3 )