Differences in obj export between versions?

[fencepost52]

I don't know if this qualifies as an actual bug, but I've noticed strange behavior between obj files generated by versions 1.5.3 and 1.5.4/and newer, unstable versions.

I use Bryce for rendering my models. Bryce always smooths a model upon import, which is what it should do, and each time the file is opened, the model should be smooth unless un-smoothed by the user. While using versions 1.5.4 and above, the model comes in smooth as intended, but each time the Bryce file is opened thereafter, the model is un-smooth. I tested models from 1.5.3 and they do not have this issue.

Was there a change in how obj files are generated between versions?

Thanks for your help. Please let me know if you need more information.

Cheers!

Art