UO Second Age

My main character has 100 STR, 25 Mana and 54 Dex..

If the stat cap is 225, I was wondering why I haven't gained any in Dex in a long time.. probably a couple weeks, this toon is my warrior so he is definitely using skills that would increase the stat..

any thoughts as to why the stat gain is not happening?

Use snooping for dex gains.

Anything else I could do? Would Hiding work?

First, make sure you still able to gain skills. Adjust your skill arrows accordingly.

Second, snooping is a great way to gain dex. The gains will be especially good in the first ten points. One strategy is to gain ten snooping, turn its arrow down, gain ten in some other dex gaining skill and then gain ten snooping again. (All this assumes you are at the 700 skill cap. What you want is to bounce back and forth between the first ten points of two skills that give good dex gains.)