Same issue as well...trying to troubleshoot but haven't had much success.
UPDATE:
Looks like the "parse tasks with transport text" script is not working with latest beta drop from Omnifocus.
I replaced "parse tasks with transport text q" with "make new inbox task with properties {name:q}" which creates a simple inbox tasks for now (until they fix the issue)
Here is the Applscript, just copy/paste into the script editor.
on alfred_script(q)
set theName to (q)
set isRunning to false
tell application "System Events"
if exists process "OmniFocus" then
set isRunning to true
end if
end tell
if isRunning is true then
tell application "OmniFocus"
tell default document
make new inbox task with properties {name:q}
end tell
end tell
else
tell application "OmniFocus" to activate
tell application "OmniFocus"
tell default document
make new inbox task with properties {name:q}
end tell
end tell
end if
end alfred_script