Sub-directly

[Motofumi Suzuki]

I set the forum page as front page, but suddenly the main domain became to redirect to the gallery page.. 

Then I couldn't find where to fix it. 

Do I need to fix something in Admin Control panel?

[Feneroin]

Yeah @Motofumi Suzuki, in Admin Panel

System / Applications

then click on star icon of Forum and it will be default page/app of your domain