i met the same issue, and i found the root cause was the OpenSSH upstream issue.

I think the root cause is that in SUSE 11 SP4 cannot run the .php file under the command line.
because in the ./bin/config file , it only a line "../scripts/setup/manage_config.php", i don't know how to fix this issue under SUSE OS.

Yes, i manually built the pcre, enable utf8 and unicode properties.
this issue was resolved.
thanks.

pcretest -C

PCRE version 8.10 2010-06-25
Compiled with

No UTF-8 support
No Unicode properties support
Newline sequence is LF
\R matches all Unicode newlines
Internal link size = 2
POSIX malloc threshold = 10
Default match limit = 10000000
Default recursion depth limit = 10000000
Match recursion uses stack

I open the debug mode, on console, i found errors:
preg_replace_callback(): Compilation failed: this version of PCRE is not compiled with PCRE_UTF8 support at offset 0
Stack trace:
preg_replace_callback called at [/lv_code/phabricator/phabricator/src/infrastructure/markup/rule/PhabricatorObjectRemarkupRule.php:189]
PhabricatorObjectRemarkupRule::apply called at [/lv_code/phabricator/libphutil/src/markup/engine/remarkup/blockrule/PhutilRemarkupBlockRule.php:78]
PhutilRemarkupBlockRule::applyRules called at [/lv_code/phabricator/libphutil/src/markup/engine/remarkup/blockrule/PhutilRemarkupDefaultBlockRule.php:17]
PhutilRemarkupDefaultBlockRule::markupText called at [/lv_code/phabricator/libphutil/src/markup/engine/PhutilRemarkupEngine.php:232]
PhutilRemarkupEngine::markupBlock called at [/lv_code/phabricator/libphutil/src/markup/engine/PhutilRemarkupEngine.php:128]
PhutilRemarkupEngine::preprocessText called at [/lv_code/phabricator/phabricator/src/infrastructure/markup/PhabricatorMarkupEngine.php:269]
PhabricatorMarkupEngine::loadPreprocessorCaches called at [/lv_code/phabricator/phabricator/src/infrastructure/markup/PhabricatorMarkupEngine.php:133]
PhabricatorMarkupEngine::process called at [/lv_code/phabricator/phabricator/src/infrastructure/markup/PhabricatorMarkupEngine.php:73]
PhabricatorMarkupEngine::renderOneObject called at [/lv_code/phabricator/phabricator/src/applications/phriction/controller/PhrictionMarkupPreviewController.php:23]
PhrictionMarkupPreviewController::processRequest called at [/lv_code/phabricator/phabricator/src/aphront/AphrontController.php:29]
AphrontController::handleRequest called at [/lv_code/phabricator/phabricator/src/aphront/configuration/AphrontApplicationConfiguration.php:257]
AphrontApplicationConfiguration::processRequest called at [/lv_code/phabricator/phabricator/src/aphront/configuration/AphrontApplicationConfiguration.php:169]
AphrontApplicationConfiguration::runHTTPRequest called at [/lv_code/phabricator/phabricator/webroot/index.php:17]

you can check this page, it is original phabricator page, it also cannot show in my server.
maybe the remarkup engine cannot work in my server, i don't know how to resolve it.

Could you tell me how to check the server error?
i don't find the errors on server.

i attached my saved webpage. The Text isn't existed the source code.