Version: (using Devel) Installed from: Compiled sources If you don't have all your calenders disabled, forward and back arrow buttons don't do anything in monthview. Also, if you have a calendar enabled with without any incidences the buttons also don't work.
Could you retest it ? I can't reproduce this bug now
yes i can, just tested it in today's trunk. I'm talking about the buttons on the toolbar, not about the mini-calendar (see-attachment). Try unselecting all calendars, or, with a calendar that doesn't have incidences in March, see if you can go to March, here it stops in February. I looked at the code and it seems there were a lot of changes on how month view handles date selection signals.
Created attachment 40624 [details] forward and back buttons
Ok can reproduce it.