Unable to select or move parts in Studio?

I was simply trying to make something on Roblox Studio when my mouse turned into the mouse you would usually see while in-game (https://tr.rbxcdn.com/725a4b8bb3f76d1c8dc7ab856e0128b0/420/420/Decal/Png)

This caused me to be unable to use any of the Studio tools (Select, Move, etc).

The only way I can select parts is by the workspace which is really inconvenient.

Has anybody else had this issue and if so, does anybody know how to fix it?

Gyazo Link: https://gyazo.com/6c9ddcffc7bc1d73e35431b9caa887a2

Thanks

Check if they are Locked its a property in the part/model, The Locked property determines whether a part (or a model it is contained within) may be selected in Roblox Studio by clicking on it.

I was browsing the devforum on roblox and noticed some people saying the default tools have been breaking. It may be related to this, perhaps you can find answers here. That post was made over a week ago, though there are some people replying that say they still have those described issues.

Otherwise, make sure you have the select tool enabled. It can get disabled under different circumstances. Ctrl+1 is the shortcut to do this.

As @VerdommeMan said, it may also be that some or most of the parts have their Locked property set to true. Make sure that the property is toggled to false so you can select them again.