In the last couple of days I remembered a few more details from last year. You found the bug back then, apparently it was some exception in the exception handling code, which would not be caught. It occured when the update server was not reachable when starting the game.
More importantly, I realized that the current gamersgate version, 1.1.00, is not the most recent version on other platforms. I didn't catch that in the beginning, because the official wiki also mentions 1.1.00 as the current version. So, chances are that the bug has been fixed months ago, but that no new version has been pushed to gamersgate.
Is there any chance of an update of the gamersgate version?
Also, I have not yet pre-ordered DQ2. But now that I found the blog post about DQ1HD, which should be a huge reduction in wasted heat and noise while playing thanks to replacing Adobe Air, makes me much more interested. Can we be assured that DQ1HD and DQ2 will be playable without internet connection, and that this will be tested before release? In that case, I will preorder soon. If not, I won't, because my gaming computer (deliberately) doesn't have internet access.