The great thing about a specific question is that it can be given a specific answer.
For example, the OP said: "There's an excellent Flickr app called SuprSetr which I'd like to automatically launch each morning at 3:55 am. How?"
Answer: Save the following as com.tjluoma.SuprSetr.plist (or whatever name you prefer, but it should end with .plist) and put it into the folder ~/Library/LaunchAgents (where ~ is your Home Directory):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>AbandonProcessGroup</key>
<true/>
<key>Disabled</key>
<false/>
<key>Label</key>
<string>com.tjluoma.SuprSetr</string>
<key>ProgramArguments</key>
<array>
<string>/usr/bin/open</string>
<string>-a</string>
<string>SuprSetr</string>
</array>
<key>StartCalendarInterval</key>
<array>
<dict>
<key>Hour</key>
<integer>3</integer>
<key>Minute</key>
<integer>55</integer>
</dict>
</array>
</dict>
</plist>
And then, once the file is in place, you should enter this command in Terminal:
launchctl load ~/Library/LaunchAgents/com.tjluoma.SuprSetr.plist
Then it will be ready to launch the app SuprSetr at 3:55 a.m. every day. (Note: if the computer is asleep at 3:55 a.m., it will run when the computer wakes up.)
From that specific example, once you understand that what this plist file does does is tell launchd to run the Terminal command:
/usr/bin/open -a SuprSetr
at the hour '3' and the minute '55', then it should be easy to extrapolate from that to other apps that you want to run at other times.
Now, if you want to write these all by hand, you can do that for free, but an app like Lingon is a good choice (I'd recommend not buying the Mac App Store version, as the app seems to me like something that Apple is not going to like in the world of sandboxing, and you'd get a more feature-rich app from the developer.
My personal preference is for an app called LaunchControl which is free to try, and then the developer asks for something reasonable like US$10, but there is no DRM, no license codes, but instead relies on the good ol' honor system. (It’s my hope that people who use it will live up to the developer's faith in that system.)
I might state the obvious. When it's the first (accidental) edit you make in a document, Undo/Command-Z will not only remove the involuntary text box, but will also revert the document state back to 'unchanged'.
After test addition: You may have to click on a 'safe' zone outside of the text box for Undo to function. Thus creating additional 'edits', you have to Undo-away. My experience is, that after two or three undos the 'edited' tag disappears behind the filename in the window title.
Just tried it and had one additional observation:
The only way I found to get the text box to appear was clicking on or near a line in the pdf. That's a feature not a bug: Preview assumes you want to fill out a form.
Hope this helps.
Eerk
Best Answer
Copy the old Preview and rename it (for example Preview_old), so you have two Previews in the Application folder. If the Preview_old gives the same failure and does not run, do the change as dante12 posted.
You have to change the GetInfo "open with" field to Preview_old for the relevant files.