ardour 2.6.1 // crashing on zoom and region automation change

i have just installed ardour v. 2.6.1. i’m experiencing a lot of crashes when i zoom in and attempt to change region automation gain envelopes.
has anyone else experienced this? this was occurring in v. 2.5 but it seems worse now.
i am running ardour on ubuntu 8.04, lenovo t61 laptop, no proprietary drivers.
thanks in advance for any help on this.


your cooperation will be appreciated.