I am playing DK1 with KeeperFX. I start the first level and I manage to attract the fly, like normal. Then no more creatures spawn, even after waiting about 15 mins! I know a beetle is supposed to spawn before you can build the hatchery and it never comes.

I even tried playing one of the KeeperFX extra levels, still no creatures spawn from the portal.

Any one else experience this?

Are you sure you've build the appropriate rooms to push the game forward?

Beetle on first level requires at least 3x3 hatchery and 3x3 lair.

It is probably this bug: https://github.com/dkfans/keeperfx/issues/662

No known cause or solution yet.

If that's the case, then level 1 is broken because it does not allow me to build a hatchery even after waiting around for 15 mins with a 3x3 lair and a fly buzzing around.

It is not the case. In fact if you have a fly, lair and treasure room only beetles can come from the portal. And only when you get your beetle will you be able to build your hatchery.

If you have mined gold, claimed a portal and have a lair and no beetle comes out in a few seconds your level/savegame is bugged. Try quitting the game and starting over completely. Don't load a save.

This was the problem, it has fixed itself. Thank you!

The problem has been found and fixed. The fix will be included in a future release.

In the meantime, in version 0.4.6 this problem can occur when you load a saved game from the main menu or while playing another level. In other words, when you save and quit a level, the next time you play you can run into this problem. I believe this mostly happens on the tutorial levels of the main campaign, but I'm sure there are some others.

The workaround is to use 'Continue Game' to continue the level. This will start the level fresh, but if you then load the saved game from inside the level you can continue the level from where you left off, without facing this bug.

Edit: It has been fixed in the 'Recent stable branch builds'. So use that or wait for version 0.4.7.