All the arcade links are doubled

I have installed the ibProArcade, and in the Arcade Homepage, I saw that, every link is like this --->

http://www.mydomain.com/forum/www.mydomain.com/forum/arcade.php?......etc..etc..

I mean, every link in the arcade's all pages have the same problem When I clicked them, they go to the "not found" page, then I manually remove the second mydomain.com/forum and then it works.

May you please help me with this issue? Why the second one come? How can I/we solve this?
Thank you for the support & response.

(you can check the situation here, look to my arcade page -->

Address to Arcade:
http://www.nmcal.com/forum/arcade.php?
Username:
arcade
Password:
arcade1238

(I use vb3.6.7 PL1)

Thank you.

I'm waiting for any help or support. Thank you

[MrZeropage]

please enable the debug-mode for me to have a deeper look on this:

open /arcade.php

set $DEBUGMODE to 1 and let me know...

[illkeyone]

Ok sir, I've enabled the debug mode.

I'm waiting for the instructions.
Thank you.

[MrZeropage]

can't the the problem this way, sorry.

Please update to v2.6.3+ and if this occured again, provide access to AdminCP+FTP via PM

[illkeyone]

I think that, it is not about the global settings. Because, I saw that in the control panel, all the links are correct. It is only in the ARCADE page.

And additionally, in the arcade page, the ADMIN PANEL link (at the bottom of the arcade page..) is as this:
"mydomain.com/admincp"
it is not "mydomain.com/forum/admincp"

I think there is a problem only at the arcade page.
I'll upgrade the version. And then contact you by PM.
Thank you Zeropage.

.illkeyone.

[illkeyone]

Hey! I manually changed something in the global settings in config.php and in the admincp, so now it is working properly

thanks to your helps&support.
and I'm sorry about taking your time.
thank you.

(and big thanks about the ibparcade, generally)