After a long time of abstinence I return to the LaTeX-World, just to find, that some things have changed unexpectedly.
Problem:
Using longtable or tabular with m{1cm} delivers the expected result. (Attachment lower section) - It's just not centered.
Using >{\center}m{1cm} jostles the lines out of alignment something like attached image (upper section)
Now I know, that the entries are too long for the cell, which is something I'll have to deal with seperately. (Unless somebody happens to have a verbatim cell environment with hard line-break handy, that is

Your help would be greatly appreciated.
And no, I _can't_ fiddle manually, as the tables will be generated automatically.
Thanks in advance,
/pipedevnull