Using KeeperFX 0.42 r749 (the last r750 has not been deployed yet to download), there are some several errors in my log playing the first level:
There is a lot of:
Sync: play_sample_using_heap: Can't start playing sample 172
Also:
Error: get_navigation_colour_for_door: Cannot find door for flagged position (255,0)
Error: get_navigation_colour_for_door: Cannot find door for flagged position (255,1)
Error: get_navigation_colour_for_door: Cannot find door for flagged position (255,2)
Error: get_navigation_colour_for_door: Cannot find door for flagged position (255,3)
Error: get_navigation_colour_for_door: Cannot find door for flagged position (255,4)
...
Error: get_navigation_colour_for_door: Cannot find door for flagged position (255,254)
And it repeats again several times.
More:
Sync: add_melee_attacker: Cannot add a melee attacker to creature FLY index 187 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature FLY index 187 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 400 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 400 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 284 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 284 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature FLY index 187 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 400 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 284 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature FLY index 187 - opponents limit reached
Sync: add_melee_attacker: Cannot add a melee attacker to creature BUG index 400 - opponents limit reached