imgburn struck?

[fpefpe]

Hello --

 

I started imgburn to burn an iso file to disc. 

 

I loaded a blank disc, started the program, selected the ISO file and  the last item in the log was that  imgburn was trying

to lock the dvd drive.  It  remained in that state -- but nothing happened.

 

I tried a 2nd time with the same outcome -- I rebooted the computer (win7) and it  seems to be working now

 

Does anyone know how the dvd could get locked up  so that imgburn could not get it?

 

Thanks