AutoCAD 2010/2011/2012 DWG Format

[#1]

Inside the trim command I cannot hit "shift" to switch to the extend command instead.

any suggestions?

[#2]

You must hold the Shift key down while picking on the object.  

[#3]

Yes I have done that but nothing happens.

[#4]

It may be a system variable issue.

i can't seem to select anything if holding down the shift key in other commands as well.

(similar post - cant toggle ortho mode with the shift key anymore - ortho comes on but i can't pick a point)

[#5]

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Command: TRIM

Current settings: Projection=View, Edge=Extend
Select cutting edges ...
Select objects or <select all>: Specify opposite corner: 2 found

Select objects:

Select object to trim or shift-select to extend or
[Fence/Crossing/Project/Edge/eRase/Undo]:

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After starting the TRIM command and selecting the cutting edges, does it remind you that you can use shift, as shown above in red?

[#6]

Yes

[#7]

my projection is set to UCS.