Grid looses it's focus...?

I have just updated my runtime to version 2.5.3, to cure a problem with a combo box not allowing me to select an item, which now works.

However, Grid's now loose there focus if I scroll to the left and then scroll to the bottom. Firefox display 's an error on line 31 of aw.js

As follows: -

this[get] is undefined
AW.system.Template=AW.system.HTML.subcl....$owner[_set](p,v,a,b,c)}this.lock()}};

My code works OK in version 2.0.2... Any Ideas?

Changing my column count to be the exact count of columns seems to cure it. It must be something to do with my dataset, because adding a couple of rows of manual data worked ok...

Um...?

Sorry I jumped the gun but still someone might find it useful in the future.

obj.setColumnCount();