How do I highlight a section of waveform for wave editing in the Modelsim-Altera software version 6.6c?

Description

Due to a problem in the ModelSim-Altera software version 6.6c, you may be unable to highlight a section of waveform for wave editing even though edit mode has been enabled.

Resolution

To work around this problem, copy the file wave.tc_ to the directory <ModelSim-Altera installation directory>/tcl/vsim and replace the existing file.

This issue is scheduled to be fixed in a future release of the ModelSim-Altera software.