Unfortunately, that is the way things are going to be under Android 4.4.
Prior to Android 4.4, apps have the ability to register for SMS messages
at a higher than normal priority. This lets them get a first look at
SMS pages and, if it turns out to be something they need to process,
block those messages from appearing in the default messaging app.
Cadpage has made use of this capability, as have a number of security
and theft prevention apps.
Unfortunately, a number of third party messaging apps, Handcent and Go
SMS in particular, have misused this feature to grab the highest
possibly priority slot, intercept all text messages, and block them from
being received by competing messaging apps. This has been a major
problem for Cadpage, and other messaging app developers which have been
pretty much forced to adopt the same practice in self defense. The most
recent version of Google Hangouts has started doing this as well.
In Android 4.4, the rules all change to eliminate this nonsense. The
user gets to specify one default messaging app, that app always gets the
text pages, and only that app has access to the message database and
only that app can send SMS messages. Other apps, such as Cadpage, can
continue to receive SMS messages, but will no longer be able to block
them from going to any other apps.
The good news is that Cadpage will continue to function under Android
4.4. And rogue messaging apps will no longer be able to block text
messages from getting to Cadpage. The bad news is that we will no
longer be able to block dispatch pages from appearing in your default
message inbox. The best you can do is use a blacklisting or spam
blocking feature in the default message app to prevent dispatch pages
from appearing there.
The only other alternative is to switch to a message service like
CodeMessaging.net or Active911.com that can push direct pages to
Cadpage. Since these do not rely on text messages, they are unaffected
by the changes at Android 4.4.