Banners & Ads - Fails to save a large number of category selections

Hi, I'm writing to report an issue I'm experiencing with the Banners & Advertisement Plugin when trying to save an advert with a large number of categories selected.
The Problem:
I want an advert to appear in almost all categories. When I go to the "Edit Advert" page and select a large number of categories (for example, selecting all categories except one), the plugin fails to save all of my selections.
After I click "Save" and then re-open the advert to check, I find that only the first 10-20 categories are still checked. The rest have been deselected automatically.

Try to check table t_ba_advert, field s_category and increase it's size , ie varchar(2000).