It goes f.e. like this:
I draw a line (no constrains) and I can move it by grabing an end or whole line by click&hold mouse button, great.
But after couple minutes of work with part and sketches I can't grab anything. Even on new created sketches and new lines. Click and drag just open rectangle selection. Oh, between these phases there is a phase when 2nd click&hold works...
When I open/create another part it is normall, but this one I must close and open again. I have no idea what it is and havent found similar problem. Anyone?
Is this a new installation or has Inventor been installed on this machine for some time.
If older install, check for any updates or hotfixes for Windows or device drivers. You may need to go back to a older system restore point.
If a new install OS version and IV version and system spec's
You may need to do a repair of Inventor or a un-install and re-install of IV following installation procedures.
Before reinstalling whole inventor try one of the command line switches that are available for Inventor exe.
Command line help
IMPORTCUSTOMIZATIONS - Import customization settings from a specified XML file
IMPORTOPTIONS - Import application options from a specified XML file
IMPORTRIBBONCUSTOMIZATIONS - Import Ribbon customization settings from a specified XML file
INSTALL - installs all required registry settings
LANGUAGE - Launch with a specified available language pack
NOSTARTUPCOMMAND - Don''t open a file or create a new one on start up. Often used with RunTextCommandFile
RUNTEXTCOMMANDFILE:<FILENAME> - Runs a file containing text commands. Can be combined with NoStartCommand
UNINSTALL - removes all registry settings, resulting in a loss of user preferences
UNREGISTER - unregisters, so that the product will reregister on next invocation, preserving user preferences.
I suggest "Inventor.exe /INSTALL" to refresh your registry settings