Hello there

I play RS 1.6a, as a Romans and have a strange bug issue. There is 537 AUC, I own Tarraco for a long time, and the Iberians send a lot of armies trying to siege and take over the town. I have garrison with two generals and some infantry & archers, and my tactics was simply wait to Iberians besieging the town, and in next turn attack and annihilate all of them. Until now everything goes smooth and without problems.
The problem is that when I want to attack with my garrison the besieging army, the error appears. There is no CTD, or freeze screen–its just the cursor goes “loop” with clepsydra icon, ant so goes on and nothing happens – no battle appears. I am also unable to click any button or menus (key shortcuts works fine although), but I can double click on my other armies & fleets and it works normal. Strange s*it, isn’t it? :C

Is there RS error or simply vanilla bug? I’ve searched through Vanilla and RS forums to find some info about this error – but nothing found. Did reinstalling the RS or RTW should help? Or maybe the saves are corrupted?

If anyone know the solution - please help, I don’t want to start new campaign (currently waiting for Imperial reforms(Palace is building nah nah ) and my shiny new legions to spread the Roman domination.

P.S. Sorry for my English
P.S. Ah, and some tech info: I play the RTW Platinum (RTW+BI+Alexander) collection, Polish language version