First, you might see if your issue is covered in the sections below.
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Read the manual here, which is also available inside iClip from its Help menu.
Hints and Tricks
Using iClip with Keyboard Maestro
See this helpful article written by an iClip user: Automatically Copy Selected Text with Keyboard Maestro and iClip.
Frequently Asked Questions (FAQ)
Why won't the iClip window hide even though I have iClip configured to "automatically show and hide"?
If you click the iClip menu bar icon to show iClip*, the iClip window will not hide until you click the iClip menu bar icon again*, even with "automatically show/hide" enabled. This is by design. Once iClip is hidden, auto show/hide will work as expected.
Alternatively, you can show and hide iClip by pressing the the hotkey (if configured), or by opening the app again (with Spotlight or by double-clicking the app icon).
How do I copy full-size pictures from Photos.app?
Apple's new Photos app makes it difficult to copy and paste pictures from the album. If you select and copy a picture from Photos, it'll appear in iClip, but as a Photos thumbnail instead of as a Picture clipping. Pasting such a Photos thumbnail into another application may not work, either, and if it works, it will be rather small.
The solution is to drag the pictures from Photos into iClip instead of using the Copy command. If you drag a picture, you will get the original, full-sized, picture, not the thumbnail. You can either drag the pictures into a bin, replacing its content, or drag them into iClip's [+] button at the botton or right, in order to place the pictures into a fresh bin. Alternatively, instead of dragging items onto the [+] button, you may also drag them onto iClip's icon in the menu bar for the same effect.
Why do I hear a sound every time I copy something to the clipboard?
When you upgraded from iClip 5.1.x to iClip 5.2, you'll start heaving a "whit" sound every time you copy something. That sound is made after iClip has detected that something has been copyied into the clipboard and has added it to iClip. To turn this sound off, open iClip's Preferences via its menu and uncheck the Play Sounds when iClip records and pastes clippings box under the Miscellaneous tab.
You can also customize the sounds.
While copying or cutting in Photoshop, you might notice that new clippings do not show up in the iClip Recorder. This is because Photoshop does not transfer the copied data to the clipboard unless Photoshop is made inactive, meaning that you bring another program to the front. Photoshop tries to be smart, avoiding filling the clipboard when it believes that it's the only app needing it - only when you switch to another app, it thinks it needs to fill the clipboard to provide the data to the other apps. Sadly, this is not the way Apple wants apps to do this, and iClip suffers as a result. We have contacted Adobe to bring this issue to their attention.
When copying text with embedded pictures from Word or Excel, they may not paste into non-Office apps correctly - often, the images will be missing. This is a common problem with Microsoft apps and is unrelated to iClip. To work around this, copy text and images separately.
Previous iClip Versions
You may download older versions here. Note that these may not work well on recent Mac OS X versions any more, though: