I missed that one.
I thought that you would only have to release the source for the modified LGPL library.
Okay, suppose, in theory, that you have two companies.
Company A modifies the LGPL'ed library and releases full source.
Company B writes a proprietary app that uses the modified LGPL'ed library.
Would Company B still be required to release the source for their app?
I don't see that.
So, what is the difference when there is one company instead of two?