Need little help with recording... :(

Well, i am trying to make a little video of us 3 and i kinda wanted to test out the recording.
The "Export Video / youtube feature"

But for some reason i cant seem to be able to record, i keep getting:
"Unable to capture back buffer: invalid enumerant"

please can someone tell me what im doing wrong? sorry i am kinda new to this

If this helps, i am using Alice 3 Beta


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while im asking :P i will take this chance to ask my noobish question!

how can i control where i want my writing to be?

So lets say "Person 1 > Says > ..hi.." how can i control where on the screen does that hi word appear?

because my think command and say command always is on the top left side :S
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Thanks a million alice community.