I mentioned the bugs on the modelside with ts7.61 on Califorum. For model side use always ts7.6. there is no new update for this side. I don't know if it is possible to save the setting of the size of a windows. If you use a cam view, it is not important. to have the same cam view of an old scene, just resize the cam windows with the value of your old image. Or a proportionnal size if the image is too big.
an other bug interesting to know: if you use a very large zoom with the cam. the scene don't save it and when you re-open the scene, the cam have a default setting for the zoom. You lost the framing. I don't know exactly the max zoom you can use before TS bug but if you need that for your render, don't forget to write the value of the zoom (in a paper

) before close TS.
It is as important to know the bug as the function of TS.
A trick: if you have a config with several windows and differents size for each, you can make a copy of the setting of TS after closed the soft. Keep these files with your work. If you need to work later with your project, you can erase the current setting and recover the old setting. Just put the old files on the folder of TS before open it.