Can't move objects with Selection Tool

None of the earlier solutions worked for me, but at the same time that Illustrator wasn't allowing me to drag items with the mouse (they were still movable with the directional keys on the keyboard) Windows was also not being able to do Drag & Drop. Instead of freaking out and resetting the workspace or even reinstalling, I looked at what was open at the moment. Only Photoshop and Illustrator. Closed Photoshop, drag and drop was back and working EVERYWHERE. I don't know what it is, but Photoshop likes to take control over other apps regularly.

Hai.....
Just close all other adobe products and again open your AI or PS (whatever it may),,,
Now you will move anything on artboard by using move tool...

Extremely Old forum, BUT if anyone has this issue, and nothing is working and you dont want to restart. Before you do, Try expanding the object. Not sure why this worked for me but it did (expand everything,except fill if you have a gradient)

After a long struggle through overnight, I found the solution. Sure it will hell you.

1.open task manager bar end task(stop or clear) all adobe updater and its services which are running out. 

2.Restart the system once or twice

3.Run illustrator cc 2019, hold down Alt+Shift+Ctrl while program startup screen.(keeps hold until you find some sort of restoration message while processing)....that it.

I hope it will help to solve a huge headache..

For any assistance regarding this issue please drop a mail. if possible I 'll help you solve it.

Thank you

Haja

Had the same issue, tried to follow the advice here, only thing that worked for me is kind of strange - Since I could select the object but not move it, after selecting an object I went to the Pathfinder window and clicked the Unit option. after that I could move it as usual. I think it has something to do with drawing inside the shape or playing with gradients before the issue occurred.

FIXED:

I had photoshop and adobe acrobat open at the same time. When I closed my photoshop and adobe acrobat instances, I was able to move objects with the mouse as well as re-order them in the layers panel. I did not have to restart.

Hi.

It happened to me and the solution was: invisible guidelines!

I went to the layer box, selected the layer with the object i wanted to move to check any object that maybe wasn't visible and noticed the guidelines. I proceeded to delete them and... Problem solved!

Hope this was helpful as well.

I had this same issue with Photoshop and Illustrator open, Closed photoshop and I could drag layers. (copied from other forum).

Sept 2018. I am still having this issue using 2017 & 2018 illustrator cc.

I am using win10.

If I have photoshop open in the background with any sort of document, dialog box open. Sometimes this means I cant move objects in Illustrator. restarting or closing background application seems to have fixed it for a while. But often happens again!

Seriously this bug has been driving me mental. I hope adobe can iron this one out!

peace!

I had the same problem. I restarted the app...I restarted with the ctrl+alt+shift combo... I restarted the computer...I uninstalled the app and I selected to not keep the preferences and I reinstalled...same the problem. I did a lot of clicks in raw and I tried to move like an angry man the object, and after the 50-60 clicks, it works again...  I don't know what was the problem, but the Windows sound was similar when something dialogue box is opened...