Two issues resulted after setup of OneAll.
1. On updating the file ==> language/en/acp/common.php, an error message (cannot modify header information) resulted which made the admin control panel inaccessible. The ACP became accessible again without the update to that file.
2. While the ACP showed up properly after omitting the update to the file ==> language/en/acp/common.php, the Board Index is not rendering properly, as if there is a Styles issue. It can be viewed on https://www.homebiz-supermarket.com/forum
Will be glad to receive your urgent assistance.
N.B. I am using Phpbb 3.0 with Prosilver Style installed.