I've read the latest posts in the bug fixer topic. That's puzzling, because as mentioned earlier...

Quote Originally Posted by Seasoned Alcoholic
I've tried this on numerous wall sections, and using a variety of different infantry and missile units. The result is that each unit should now climb up any wall section.
...I've actually tested this first hand in custom battles, and the proposed fix worked perfectly. I'd go to the trouble of posting screenshots, but its just fiddling around and setting them up at a file hoster.

Please test this fix for yourselves and post some screenshots and feedback of your progress in custom battles / your campaign.