Sure
I've had this issue a few times now (about 4 times I think). It happens mostly when my maps reach the last fase of completion. After I compile the map, it looks like there's a leak, but there really isn't. I've done extensive searching after trying to find the non-existent pointfile. Then, when I begin checking my lightmap scales, some faces have values like 9 (mostly 9, though I've had faces with a lightmap scale of 11 assigned to them).
After this, no matter what I change in lightmap scale settings, my map will not compile like it should: the map still looks like there's a leak (although it differs a little bit in how it looks: lighting is fine, there's just alot of the map that doesn't render, or only renders when you look at the faces in a certain angle).
I must honestly say that I, with my limited knowledge, can't be sure what the source of this problem is. But what I see is a badly rendered level, no apparent compile log errors and weird lightmap scale values being assigned to random brushfaces.