Runtime conflict with KF5Plasma and KDE 4 in same prefix

[Michael Palimaka]

Hi,

I have run into a strange issue when KDE 4 and KF5Plasma are installed
into the same prefix (I can reliably reproduce the issue by
installing/uninstalling KF5Plasma and restarting KDE).

Simply, the vertical bar key "|" does not work - it prints nothing. If I
run xev from konsole it detects the keypress, but in any other
application it is as if I never pressed the key at all.

Any ideas?

Best regards,
Michael