boost::shared_ptr seems to disappear when using Linux - c++

Question

I am using a boost::shared_ptr to point to a plugin class. Plugin is a map <string, shared_ptr>. The first time I find a certain plugin in the map, it works fine. However, any subsequent time I try to find a particular plugin, I get a SIGSEGV error. When stepping through my code, I get to foundPlugin = a->second->onCommand(command);and find that a->second is not accessible anymore. This error only happens when I am running in Linux, however. I have no issues while running in Windows. Is there some sort of issue with boost::shared_ptr and linux? I have tried using std::shared_ptr, but I have to use a boost::dll::import function that returns a boost::shared_ptr, and I haven't found an alternative for that yet. Any insight is greatly appreciated!
I load plugins like this:
bool PluginManager::loadPlugin(std::string pluginPath, std::string
pluginName, std::string pluginType)
{
bool couldLoad = false;
boost::filesystem::path libPath = boost::filesystem::current_path();
boost::shared_ptr<my_plugin_api> plugin;
std::cout << "Loading the plugin " << pluginName << std::endl;
if (pluginName == "")
{
pluginName = "plugName";
}
try
{
plugin = boost::dll::import<my_plugin_api>(
libPath / pluginName,
pluginType,
dll::load_mode::append_decorations
);
Plugin.insert(std::pair<std::string,boost::shared_ptr<my_plugin_api>>
(pluginName, plugin));
std::cout << "Loading the plugin " << pluginName << " (SUCCESS)" <<
std::endl;
couldLoad = true;
}
catch (const std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return couldLoad;
}
After much more testing, I feel like my problems are in the above section of code. the boost::dll::import function acts as if it finds a .so, but does not return anything in the boost::shared_ptr, which in turn causes the second snippet of code to fail. Any ideas of why this boost::dll::import function might be acting weirdly in Linux?
bool PluginManager::onCommand(const char* command, const char* pluginName)
{
bool foundPlugin = false;
auto a = Plugin.find(pluginName);
if (a == Plugin.end())
{
std::cerr << "plugin " << pluginName << " not found" << std::endl;
}
else
{
foundPlugin = a->second->onCommand(command);
}
return foundPlugin;
}