I'm sure you know this, but I have to ask - how many IR slots are there?

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All I've got...all I've got is insane!

There's 1. but the problem is, I can't activate Lehtonen without putting someone else on IR. So if I hit submit, it says I'm over the roster limit. So, do I have to wait until tomorrow to activate Lehtonen again?

Yeah this was an issue with Yahoo. I was trying to change rosters in all three of my leagues before bed last night and it just wouldn't go.

Ah true, didn't think of that as Kiprusoff should have the IR option regardless so you can swap with Lehtonen. Try tomorrow's roster and see what happens. But the option should've still been there on today's roster I would assume.

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All I've got...all I've got is insane!

Here's a workaround that worked for me for swapping 2 injured players in and out of IR spots:

(1) Place the active player "A" that you want to move to IR to a BENCH spot.

(2) SUBMIT changes.

(3) Move player from IR to active spot and move player "A" from Bench to IR.

(4) SUBMIT again.

Having to Bench the player you want to swap to IR seems stupid... but that's Y! for you.