I'm encountering a problem when trying to use both the "Select which groups to move when inactive" (im_moveInactive_group) and the "Number of posts to get moved?" (im_moveInactive_post) settings at the same time.
I tried a clean reinstall, and the issue is still reproducible. Here are the STR from a clean installation: Go to Other Apps -> Manage Inactive Members -> Settings -> Move Inactive Members.
Select a group of your choice from the "Select which groups to move when inactive" listbox.
Hit the Update Settings button. You'll see that the group selection was correctly saved (when the page reloads, it's still highlighted in the listbox).
Look up the ID of that group. That bit of info can be found in Members -> Member Groups -> Manage Member Groups (next to each group in the list there's an ID).
Go back to the Other Apps -> Manage Inactive Members -> Settings -> Move Inactive Members page.
Insert a number in the 'Number of posts to get moved?' textbox, corresponding to the group ID you found. i.e. if the group you selected had ID = 3, insert 3.
Hit the Update Settings button.
Expected result: The number of posts gets saved, and every other setting is unchanged.
Actual result: The number of posts gets saved, but the group listbox gets cleared. You can no longer select the group until you change the posts number setting to any other value.
I'm using IP.Board 3.3.1.