[pdftex] linux latex process hanging

[James Naadjie]

To whom it may concern;
I’m currently using latex for pdf conversions and ran into a problem recently which I suspect could be a bug of sorts. When converting a TeX file with missing figure files, I get a warning see below: It seems the latex process on my linux/ubuntu freezes or goes into an infinite loop of some kind. I was hoping you might shed some light on this issue for me. 

Thanks For you assistance

Regards
James Naadjie
APS

Warning: TeX file called in following missing figure files:
figure2,figure3,figure1-ver21.pdf
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