Hi, When I try to change password I always get "Password contains invalid chars...." for all different case and number combinations.
There are some rules you have to follow for the password:
"Minimum 6 (six) characters where at least 1 (one) character is NOT a letter or number (but f.ex. #,_%, etc) and cannot be placed in the beginning or end of the password"
I managed to change the password when adding "capital letters" to the rule you suggest. please update the post and I can mark it as an "answer".
When I last tested this it actually asked me for a minimum of 12 characters, still no information about the rules.