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Unfortunately, there's nothing we can do about it. TeXnicCenter relies upon the Scintilla editing component which may cause slowdowns when editing large documents.

As a workaround you can enable the line numbers and use their margin for selection.

An x on every tab would require too much additional horizontal space. However, you can press the middle mouse button over any tab to close it.

You have to define BibTeX as a postprocessor for every additional bibliography. The multibib support mentioned in the news refers to command recognition in the structure view.

Just remove sumatrapdfprefs.dat stored in the %AppData%\SumatraPDF directory.

This is a bug in alpha 3 which has been already fixed. To make inverse search work again remove the apostrophe behind the last square bracket, i.e. use

-inverse-search "\"C:\Programme\TeXnicCenter Alpha\teXniCcenter.EXE\" /ddecmd \"[goto('%f','%l')]\""

as Sumatra PDF command-line arguments ...

TeXnicCenter doesn't perform any package maintenance.

All the settings are stored in the registry. TeXnicCenter 2.0, for instance, uses the HKCU\Software\ToolsCenter\TeXniCenterNT registry key.

Fixed in 1151, thanks for the report. All configurations are Unicode-enabled now.

A simple inclusion of the microtype package may fix many of the over/underfull boxes, particularly if you use pdflatex.