older versions of zabbix could create screens with rows/columns set to 0. this is handled in the monitoring section by showing a user friendly message - but is a bit weird now.

for example, a screen named "a" will result in this message :

No rows in screen. a

regression, broken by :

------------------------------------------------------------------------
r24420 | eduards | 2011-12-30 09:59:18 +0200 (Fri, 30 Dec 2011) | 1 line

..F....... ZBXNEXT-912 redesign Configuration->Slides

note that simply removing the dot most likely is not a correct solution !