In the Roundcube dev-List, I currently have 11,368 messages. When German as UI language is enabled and I click on the "Show last set" right-arrow/button below the message list, the left-arrow/button "Show first set" disappears completely.
Apparently the string between the arrows is too long, as this problem doesn't occur in the English UI:
German: "Nachrichten 11355 bis 11368 von 11368" English: "Messages 11355 to 11368 of 11368"
The longer German string apparently shifts the "Show first set" left-arrow/button so much to the left that it is neither visible nor clickable anymore. This may also apply to languages other than German, but I couldn't test them all.
This applies to the Classic skin, Larry untested (but most likely it's even worse there).
Michael Heydekamp Co-Admin freexp.de Düsseldorf/Germany