You have checked the queue? If yes, or you already have multiple miners setup, it would be strange.
Both of my testing miners are running fine.
```
1536117ms th_a       witness.cpp:419               on_applied_block     ] hash rate: 5636 hps  target: 28 queue: 96 estimated time to produce: 793 minutes
```

```
1599491ms th_a       witness.cpp:419               on_applied_block     ] hash rate: 6001 hps  target: 27 queue: 95 estimated time to produce: 372 minutes
```

I did that. I'm using boost 1.60.0, which is default on Arch. Here's the output:
```
[ 67%] Building CXX object libraries/chain/CMakeFiles/steemit_chain.dir/database.cpp.o
/home/marko/steem/steem/libraries/chain/database.cpp: In member function ‘steemit::chain::signed_block steemit::chain::database::_generate_block(fc::time_point_sec, const string&, const fc::ecc::private_key&)’:
/home/marko/steem/steem/libraries/chain/database.cpp:719:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if( new_total_size >= maximum_block_size )
                          ^
/home/marko/steem/steem/libraries/chain/database.cpp: In member function ‘void steemit::chain::database::set_hardfork(uint32_t, bool)’:
/home/marko/steem/steem/libraries/chain/database.cpp:2991:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for( int i = hardforks.last_hardfork + 1; i <= hardfork && i <= STEEMIT_NUM_HARDFORKS; i++ )
                                                ^
In file included from /home/marko/steem/steem/libraries/db/include/graphene/db/object_id.hpp:25:0,
                 from /home/marko/steem/steem/libraries/chain/include/steemit/chain/protocol/types.hpp:4,
                 from /home/marko/steem/steem/libraries/chain/include/steemit/chain/protocol/base.hpp:3,
                 from /home/marko/steem/steem/libraries/chain/include/steemit/chain/protocol/steem_operations.hpp:2,
                 from /home/marko/steem/steem/libraries/chain/database.cpp:2:
/home/marko/steem/steem/libraries/chain/database.cpp: In lambda function:
/home/marko/steem/steem/libraries/chain/database.cpp:3058:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       FC_ASSERT( hardfork == hfp.last_hardfork + 1, "Hardfork being applied out of order", ("hardfork",hardfork)("hfp.last_hardfork",hfp.last_hardfork) );
                           ^
/home/marko/steem/steem/libraries/fc/include/fc/exception/exception.hpp:325:30: note: in definition of macro ‘FC_EXPAND_MACRO’
 #define FC_EXPAND_MACRO( x ) x
                              ^
/home/marko/steem/steem/libraries/fc/include/fc/exception/exception.hpp:332:11: note: in expansion of macro ‘UNLIKELY’
       if( UNLIKELY(!(TEST)) ) \
           ^
/home/marko/steem/steem/libraries/chain/database.cpp:3058:7: note: in expansion of macro ‘FC_ASSERT’
       FC_ASSERT( hardfork == hfp.last_hardfork + 1, "Hardfork being applied out of order", ("hardfork",hardfork)("hfp.last_hardfork",hfp.last_hardfork) );
       ^
c++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.
libraries/chain/CMakeFiles/steemit_chain.dir/build.make:62: recipe for target 'libraries/chain/CMakeFiles/steemit_chain.dir/database.cpp.o' failed
make[2]: *** [libraries/chain/CMakeFiles/steemit_chain.dir/database.cpp.o] Error 4
CMakeFiles/Makefile2:985: recipe for target 'libraries/chain/CMakeFiles/steemit_chain.dir/all' failed
make[1]: *** [libraries/chain/CMakeFiles/steemit_chain.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2
```

What version of Boost is installed on your system? What version of gcc (output of gcc - v)?

It seems unlikely, but maybe there is an issue with your version of Boost that is somehow only triggered now in v0.5.0?
Manually compiling Boost 1.57 or 1.58 and pointing to it in the cmake step might be worth a shot.

Also, ENABLE_CONTENT_PATCHING is no longer necessary with v0.5.0. If you want a low memory node do `-DLOW_MEMORY_NODE=ON`. 

And finally, go on the Slack [#help](https://steem.slack.com/messages/help/) channel if you want more direct interactive help.

That's what I'm doing, but doesn't work on Ubuntu or Arch. Which distro are you using?

hmmm Network problems can cause this as well. Have you checked your connections?