The .49 standard error...I hope that was on the "None" parameter and not on a level of an attribute. I'm assuming so. All standard errors for attribute levels should have 0.05 or less in typical applications with decent sample sizes (such as n=250).
It's extremely typical (with moderate to large-size attribute lists) to get a "timed out" message for every respondent. That just means that all the possible relabelings and swaps that could have been done to further optimize the design were not done. This doesn't mean that the design is bad, it just means that within the half second or so allotted for each respondent to find near-optimal designs, it couldn't do all the possible searching that the algorithm could have permitted--it had to break out early. Typically means you got 99.5% of the way there, not 100% of the way there...which is splitting hairs and just doesn't matter.
The turning off "avoid dominated concepts mode" meant that the algorithm got stuck when trying to avoid dominated concepts within the set of near-neighbor cards, so it turned off the code preventing dominated concepts. In the grand scheme of things this isn't such a big deal, since for years ACBC didn't even have an option for avoiding dominated concepts and it performed very well. But, if it was really important to you that every respondent never sees a dominated concept, then this is a problem.
"Turning off balancing code" means that the algorithm was struggling so much to generate near-neighbor concepts that it turned off its checks to find decent level balance across non-BYO chosen levels. Could mean some loss in efficiency for such respondents, so I'm glad this message occurred very few times.
The last message "proceeding with 1 concept" would indicate that the algorithm just couldn't come up with near-neighbor concepts and proceeded with just one concept. Do you have lots of attribute prohibitions? This would be a bad thing to happen to a real respondent. It means the ACBC survey couldn't proceed beyond the BYO question and would have skipped out of ACBC onto the next question in SSI Web.