First please try the latest version. Some JS has changed and might solve your issue.
Normal case: reinstall the module.
Alternatively, if you already have a lot of settings made, i recomend to NOT use the installer in this certain case, but rather un-zip the new version's package and then manualy overwrite the modues files on the server ( found in /modules/mod_lab5_mobile_videos/ ).
The next step is also important : clean the modules cache. For this, in the backend goto
"Tools" -> "Clean Cache" -> mark them all and press "Delete". After that reload the (front)page and check back about wether the probs have now gone.