But think that, when Tapatalk is installed, depending on the ACP options and how well it is coded for phpBB 3.1, it can mess up your usergroup permissions and permission levels (which is a general problem on all forum systems, not just phpBB 3) and can cause problems with some functions of the forum for TT users, like unable to use the private message system or problems with the editors. These problems then can not be solved by you, but by the dev team of TT (and only if they want to).

TT was the topic of several security and network problems in the past, and I for myself had enough trouble with it on both the server and client side just to half a year ago, which resulted in the permanent ban of Tapatalk on both sides.