Certain custom games unhostable?

[L0rd_Yoshi]

Hi, I tried to host a few specific games, but upon clicking the create game button, I was instead kicked to the previous screen. It isn't just me, other people have tried hosting the same games and have met with the same error. The last two maps that did this are Loap 2 gold and Phase Killer x1.2.8 (but not Phase Killer x1.1.5). Any info? Thanks.

[Kala]

Some old maps before patch 1.24 wont work.

[Adiktuz]

either that or they aren't compiled correctly...