Regarding: URGENT PLEASE HELP
If you don't want to touch the .php files (that's understandable), delete the plugin and reinstall it. (You won't lose your data. But yu will lose any changes to the plugin's .css file, so put it somewhere safe first.) The plugin is now EXACTLY the 2.4 plugin. So the error that was encountered has always been there, it was just noticed with robsanders had a server with stronger or less forgiving error/warning handling. Having re-installed it, if it does not work then something else changed.
I don't know what you mean by
I can not make content changes or upload new photos to the site
Do you mean just the games? Or ALL site content? If you uninstall and reinstall, you will have what you started with and if it worked before, it should work now.
Re: I also just noticed that time is off in the schedule.
What does that mean? Please check the Unix DTG and Date at the bottom of the Game Add/Edit window. What's not right? Are the times consistently off by a certain number of hours? Then check the WordPress Timezone setting under general settings. Did it change? Did the system time on your server change? In this forum you will find several threads on date-time issues but NOTHING in the code regarding date-time has changed (until 3.0, see below).
The other thing you can do is look at how your server is handling warnings and errors and see if (a) that's changed or if (b) you can weaken it.
Version 3.0 will be out as soon as I can get through this issue. Should be sometime next week, the latest.