Just tested RoundCube with the new Larry theme (actually our customization based on Larry) under an old browser version, insufficient for RoundCube (FireFox 2.0 in this case...)
Seems to me the error message should NOT include any of the toolbar stuff, above it?
Wouldn't this be better to just show the error-box info, in place of the login box?
See screenshot attached: error as it now appears is on top & how it should probably look, seems to me, is below...
-JC
{Edit} Never mind the chat bar & menu on the screenshot... those are just custom tweaks for RC on our site.
Point is the same about error message and/or RoundCube toolbar...