Quote from Samsara:
Just a guess, but it could be related to how data manager operation is improved in 11. I believe if you go through <a href="http://kb.esignalcentral.com/display/2/index.aspx?c=12&cpc=40O2r6eeyG0Jfuy2sd5gAr4LG2c3&cid=1&cat=&catURL=&r=0.773735404014587">this setup</a> there might be an improvement to 10.6's data stream. I wouldn't recommend doing it while the market's open -- I could never get it to work myself, and eSignal wouldn't operate if I ran as admin (my UAC is on). Also, maybe Vista/W7's visual display settings could be set to basic if you have a feeling 10.6 is a little slower. Just throwing ideas out there while sitting in a trade.
On reflection, I think I was a bit uncharitable in my critique of eSignal, because my life basically depends on their product and I've always appreciated how it looks and operates (save when their servers couldn't handle the data back in... 2005 or so) . I don't think I'm as sharp as you though, and I have a feeling you have a symphony going whereas I've got this one fatass on a rickety chair playing a jaw harp, so these micro changes in appearance are more untenable for your well-tuned set. I'll refrain from venting, although I'm committed to learning NT at the same time now.
On a side note, I ALWAYS get XML errors when backtesting. After about 5 runs, the Strategy Analyzer always fails. This is likely due to said 600-line fatass being too much to handle. Plus, recently there have been periods in the backtest where I believe the script stopped running altogether (one bizarre trade spanning 3/20/2010 - 5/21/2010, despite plenty of logic to cover). I'd like to see how it runs in 11, but the core javascript has seriously changed.