I have very similar symptoms. (view pdf button hangs Lyx, and I have to forcefully kill the window.)
Lyx 1.6.4 on Karmic. I was able to export to plain tex, then pdflatex on the command line a couple of times and it produced correct pdf output, including the embedded pdf file. It gave a warning:
pdfTeX warning: pdflatex (file ./filename.pdf): PDF inclusion: found PDF version <1.6>, but at most version <1.4> allowed.
So I am about to see if I can convert back to pdf 1.4 and see if that helps.
I have very similar symptoms. (view pdf button hangs Lyx, and I have to forcefully kill the window.)
Lyx 1.6.4 on Karmic. I was able to export to plain tex, then pdflatex on the command line a couple of times and it produced correct pdf output, including the embedded pdf file. It gave a warning:
pdfTeX warning: pdflatex (file ./filename.pdf): PDF inclusion: found PDF version <1.6>, but at most version <1.4> allowed.
So I am about to see if I can convert back to pdf 1.4 and see if that helps.
-Keith