Custom Quests - Freezing..

I DL'ed a couple Custom Quests. I'm using ZC Version 2.10
I know how to load them, as I've used ZC many times (I first DL'ed it about 6 years ago, whatever version that was back then..).

However, once I begin my quest, the game freezes. I can see Link on the opening screen, but I can't move him. It's frozen.

The game has worked fine with all the pre-loaded quests. I only have this problem with the 2 quests I have downloaded (one of them is Alphadawg's Unofficial Third Quest - I've played this quest many times before on past versions of ZC with no problems whatsoever).

I tried ZC fullscreen, and small screen, and I still have this problem. If anyone can shed some light on this, thank you.

This is quite a common problem - either press F6 and select 'Continue', or play the quest in the version it was made in.