Snapping :: Cursor Jumping Around


When my cursor gets near an object in any PowerCADD v6 drawing, I see the O light up in the Snap Window and the cursor appears to jump away from the object. It seems that O snapping (is that Origin?) is always on, what's happening and how do I fix the situation?


PowerCADD v6 and Mac OS? X Jaguar
PowerCADD v7 and Mac OS X Tiger (10.4.4) or newer recommended


O snapping is the Offset Snap, allowing you to specify how far away from an objects vertex a snap should occur. This would explain why the cursor appears to be jumping away from an object.

O snapping only occurs when the O key is pressed and the mouse is near an objects vertex

You can specify the x,y offset by pressing Option + O and making the desired adjustments to values in the Snap Offset dialog as shown here. The settings you specify will remain in effect until you change them.

It's also possible something happened to damage your PowerCADD Defaults file ( the defaults file contains various basic application settings). What exactly causes a defaults file to get damaged is , frankly, unknown. However a damaged defaults file can explain a variety of unknown erratic behavior.

It's also possible something happened to your Mac OS X disk permissions which could be causing a problem with the PowerCADD Defaults file. Again, specifically what causes a permissions problem is unknown but with the introduction of a multi-user Unix based OS, Mac OS X contains tens of thousands of files all of which contain unique permission settings and which must coexist. One damaged preference file can have a chain reaction into various small issues such as this.

What to do

By default, all snapping functions, including O snapping are on all the time (unless you specifically change the drawing setup settings). If you do not press the O (oh) key when drawing then the offset snap should never be envoked and the condition you're seeing shouldn't occur.

PowerCADD Defaults:
If you have not invoked O snapping and the problem persists then you can try removing your PowerCADD Defaults file, it may be they have become damaged. To remove your PowerCADD Defaults file, do this:

  1. make sure PowerCADD isn't running (quit the application)
  2. open your UserHomeDirectory/Library/Preferences/PowerCADD folder
  3. drag the file PowerCADD Defaults onto your Desktop
  4. relaunch PowerCADD and see if the problem persists

Note, this operation causes PowerCADD to build a new defaults file with factory default settings you will need to go back and adjust your application preferences.

If the problem goes a way they something had damaged the preferences file causing the problem. If the problem persists or shows up again after a while then it could be a lower level problem with OS X permissions.

To address a recurring problemdo this to repair your OS X disk permissions:
Note: This would apply if the problem is occurring with PowerCADD running in OS X or even if you're running an older version of PowerCADD in Classic under OS X.

Quit all open applications before repairing disk permissions then:

  1. remove the damaged owerCADD Defaults file as noted earlier
  2. launch Apple's Disk Utility application (Applications/Utilities/Disk Utility)
  3. click on the First Aid tab
  4. in the right hand pane, click on your startup disk icon
  5. click Repair Permissions

The process will take a while but when complete, you should try launching PowerCADD again and see if the problem shows up again. If you're getting the problem repeating consistently then it's clearly something unique to your operating system or installation of PowerCADD. You should run all the standard Mac OS X disk checks, permissions and various CRON? house keeping scripts along with Disk Warrior if necessary to make sure your disk is in top shape, then do a clean install of PowerCADD (see other articles here for specifics on those subjects). You should also make sure you are running the latest installations of PowerCADD as posted on Engineered Software's website XTNL URL and discussed in other articles here. If the problem is persisting in Mac OS 9 then the same advice applies but use the Mac OS 9 specific utilities (Disk Warrior is a great one).

We hope that helps

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