[Verizon Droid Incredible 2] jschmier:
The issue also seems to appear to exist in the OTA as well as It has been reported in the HTC support forums. You will also notice that the Clock app is missing from the applications list, so it cannot be launched manually. The current suggested "fix" is to perform a factory reset, however I have seen at least one report that this only temporarily corrects the issue.

After flashing this ROM, it was working fine for me. However, after a few days it has stopped working and I don't know exactly what I did that may have affected this. The WorldClock.apk is still present in the /system/app directory and I have verified that it is identical to the files from the ROM, but when I press the clock widget I see the following in the logcat output:

I/ActivityManager( 1477): Starting activity: Intent { act=android.intent.action.MAIN flg=0x14000000 cmp=com.htc.android.
worldclock/.WorldClockTabControl (has extras) } from pid 1605
E/HostActivity( 1605): Unable to find explicit activity class {com.htc.android.worldclock/com.htc.android.worldclock.Wor
ldClockTabControl}; have you declared this activity in your AndroidManifest.xml?
E/HostActivity( 1605): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.htc.androi
d.worldclock/com.htc.android.worldclock.WorldClockTabControl}; have you declared this activity in your AndroidManifest.x
ml?
E/HostActivity( 1605): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1541)
E/HostActivity( 1605): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1515)
E/HostActivity( 1605): at android.app.Activity.startActivityForResult(Activity.java:2988)
E/HostActivity( 1605): at com.htc.launcher.Launcher.startActivityForResult(Launcher.java:3330)
E/HostActivity( 1605): at android.app.Activity.startActivity(Activity.java:3094)
E/HostActivity( 1605): at com.htc.home.HostActivity.startActivity(HostActivity.java:35)
E/HostActivity( 1605): at com.htc.widget.clockwidget.util.MyUtil.launchWorldClockAp(MyUtil.java:30)
E/HostActivity( 1605): at com.htc.WeatherClockWidget.WeatherClockWidgetView.launchWorldClockAp(WeatherClockWidgetView.j
ava:168)
E/HostActivity( 1605): at com.htc.WeatherClockWidget.WeatherClockWidgetView.access$000(WeatherClockWidgetView.java:75)
E/HostActivity( 1605): at com.htc.WeatherClockWidget.WeatherClockWidgetView$1.onClick(WeatherClockWidgetView.java:589)
E/HostActivity( 1605): at android.view.View.performClick(View.java:2532)
E/HostActivity( 1605): at android.view.View$PerformClick.run(View.java:9308)
E/HostActivity( 1605): at android.os.Handler.handleCallback(Handler.java:587)
E/HostActivity( 1605): at android.os.Handler.dispatchMessage(Handler.java:92)
E/HostActivity( 1605): at android.os.Looper.loop(Looper.java:143)
E/HostActivity( 1605): at android.app.ActivityThread.main(ActivityThread.java:4293)
E/HostActivity( 1605): at java.lang.reflect.Method.invokeNative(Native Method)
E/HostActivity( 1605): at java.lang.reflect.Method.invoke(Method.java:507)
E/HostActivity( 1605): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/HostActivity( 1605): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/HostActivity( 1605): at dalvik.system.NativeStart.main(Native Method)

Update

I managed to get the Clock working again by using adb to remove and restore the Clock and Clock Widget applications. The Clock application also shows up in the applications list so I can launch it manually. I don't know if all these steps are necessary, but here's the process I followed:

Wiped Clock application data from Titanium Backup (free version)

Saved copies of the .apk files

adb shell pull /system/app/WorldClock.apk
adb shell pull /system/app/HtcClockWidget.apk

Removed the .apk files and rebooted into ClockworkMod recovery

adb remount
adb shell rm /system/app/WorldClock.apk
adb shell rm /system/app/HtcClockWidget.apk
adb shell sync
adb reboot recovery

Wiped cache partition, wiped Dalvik cache, fixed permissions, and rebooted

Restored .apk files and rebooted again

adb remount
adb push HtcClockWidget.apk /system/app/
adb shell chmod 644 /system/app/HtcClockWidget.apk
adb push WorldClock.apk /system/app/
adb shell chmod 644 /system/app/WorldClock
adb shell sync
adb reboot

I hope that someone finds this information useful and have the same success should they come across this issue.