We running WHD 12.5.0, me well aware that WHD 12.5.2 is available for a while now.
The information provided of the client / tech account link and the password changes puzzles me. I didn't get it. Which password needs to be changed? What happens to the WHD accounts we only have for techs? Do we have to generate a user account (which normally won't be needed).
Never the less, WHD became sluggish, so we decided to upgrade to 12.5.2, even so we were hesitant to do so for month. The update failed and we had to go back to 12.5.0.
We have a service call with SolarWinds, but this is not sorted yet.
The update removed LDAP/AD connection from Tech accounts, if the technician is linked to a client account that has the LDAP/AD connection then you can still use LDAP/AD.
If you have upgraded to the latest version from a previous one, there was a procedure to go through before the upgrade so you weren't hit by the password issue that you are referring to.